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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Summary of Stock Option Activity
A summary of employees and directors option activity under the Company's Stock Option Plans as of December 31, 2017is as follows:

   
Number of options
    
Weighted-average exercise price
    
Weighted- average remaining contractual term
(in years)
    
Aggregate intrinsic value
  
                         
Outstanding at January 1, 2017
    
6,028,888
    
$
14.33
      
3.27
    
$
5,070
  
Granted
    
1,768,300
      
16.22
                  
Exercised
    
(693,166
)
    
15.56
                  
Expired
    
(58,700
)
    
19.12
                  
Forfeited
    
(496,279
)
    
14.46
                  
                                 
Outstanding at December 31, 2017
    
6,549,043
    
$
14.66
      
3.08
    
$
31,202
  
                                 
Exercisable at December 31, 2017
    
2,090,022
    
$
15.00
      
1.37
    
$
9,267
  
                                 
Vested and expected to vest at December 31, 2017
    
5,996,960
    
$
14.63
      
2.98
    
$
28,744
  
 
Summary of Stock Options Outstanding by Exercise Price Range
The options outstanding under the Company's Stock Option Plans as of December 31, 2017, 2016 and 2015 have been separated into ranges of exercise price as follows:

December 31, 2017
  
Outstanding
    
Exercisable
  
           
Weighted
                    
           
average
    
Weighted
          
Weighted
  
Ranges of
          
remaining
    
average
          
average
  
exercise
    
Number of
    
contractual
    
exercise
    
Number of
    
exercise
  
price
    
options
    
life (years)
    
price
    
options
    
price
  
                                 
$
10.04-14.74
      
4,253,357
      
2.94
      
13.53
      
1,227,982
      
14.00
  
$
15.09-19.30
      
2,252,686
      
3.36
      
16.63
      
840,540
      
16.26
  
$
20.62-23.66
      
43,000
      
2.47
      
22.79
      
21,500
      
22.79
  
                                             
         
6,549,043
                      
2,090,022
          
Summary of RSU Activity
The following table summarizes information relating to RSUs, as well as changes to such awards during 2017:

   
Year ended
December 31,
  
   
2017
  
   
Number in thousands
  
       
Outstanding at January 1, 2017
    
1,282,930
  
Granted
    
400,495
  
Vested
    
(277,720
)
Forfeited
    
(126,203
)
         
Outstanding as of December 31, 2017
    
1,279,502
  
Summary of Stock-Based Compensation Expense
Stock-based compensation was recorded in the following items within the consolidated statements of income (loss):

   
Year ended
December 31,
  
   
2017
    
2016
    
2015
  
                   
Cost of revenues
  
$
241
    
$
180
    
$
141
  
Research and development, net
    
3,867
      
3,339
      
2,456
  
Sales and marketing
    
6,894
      
5,661
      
4,098
  
General and administrative
    
2,029
      
2,340
      
2,634
  
                         
Total expenses
  
$
13,031
    
$
11,520
    
$
9,329